# NHTSA Engineering Analysis EA97013
> **DYSFUNCTION TURN SIGNAL ASSEMBLY** · Opened 1997-05-30 · Closed 1999-11-23
## Investigation
- **Action number:** EA97013
- **Type:** Engineering Analysis
- **Open date:** 1997-05-30
- **Close date:** 1999-11-23
- **Manufacturer:** Grote Industries, LLC
- **Affected makes:** GROTE
- **Affected components:** EXTERIOR LIGHTING
- **Affected model years:** 9999
- **Affected (make, year) variants:** 1
## Summary

SEVERAL TURN SIGNAL ASSEMBLY MODIFICATION HAVE BEEN IDENTIFIED DURING THE COURSE OF THE SERVICE QUERY INVESTIGATION.THE SUBJECT SWITCHES ARE SOLD TO 5 TRUCK OEM'S.DURING THE COURSE OF THE SQ, SEVERAL FAILURE MODES WERE IDENTIFIED THAT WOULD RENDER THE TURN SIGNAL INOPERATIVE.THESE TURN SIGNAL ASSEMBLIES ARE USED ON CLASS 6, 7, AND 8 HEAVY DUTY TRUCKS AND TRACTOR TRAILER TYPE VEHICLES.

## Source
- [NHTSA ODI investigation page](https://www-odi.nhtsa.dot.gov/owners/SearchResults?searchType=ID&targetCategory=I&searchCriteria.nhtsa_ids=EA97013)
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